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== Clones and equivalents ==
In 2016 after twenty or more years of diminishing availabilty, in response to [[Coolaudio International Ltd.|Coolaudio's]] [http://www.coolaudio.com/features-page.php?product=V3340D V3340] re-design of the part to the same specifications, OnChip Systems remanufactured the 3340.<ref>[https://www.facebook.com/curtischips/posts/1173548609342828 Curtis Electromusic Specialties], Facebook, 5 June 2016</ref><ref>[https://ask.audio/articles/curtis-family-speaks-out-against-behringer-synth-clone-plans-using-cem3340 Curtis Family Speaks Out Against Behringer Synth Clone Plans Using CEM3340] by Rounik Sethi, Ask.Audio, 21 Mar 2017</ref><ref>[https://web.archive.org/web/20190613235511/http://synth-diy.org/pipermail/synth-diy/2017-September/166135.html CEM3320/V3320], SDIY list, Sep 2017</ref>
=== Alfa parts ===
[[Alfa Rpar AS]] produces the AS3340 and AS3345. The 3340 is available in both 16 pin DIP and SOIC packages, the 3345 is available in 18 pin DIP and 24 pin QFN packages. Alfa recommend a 51K resistor on the pulse output instead of the 10K resistor that the CEM3340 uses. <ref>[https://electricdruid.net/product/as3340-vco/ AS3340 VCO], Electric Druid</ref><ref>[https://www.alfarzpp.lv/eng/sc/AS3340.pdf AS3340] data sheet</ref>
The AS3340-HYB is pin compatible with the CEM3340. It is a AS3345F with an additional PWM comparator in order to minimize frequency modulation by the PWM control circuit.<ref>[https://modwiggler.com/forum/viewtopic.php?t=217648 AS3340-HYB New VCO chip], Mod Wiggler Forum, May 2019</ref><ref>[https://www.alfarzpp.lv/eng/sc/AS3340-HYB.pdf AS3340-HYB] data sheet</ref>
== Usage ==
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* [http://secretlifeofsynthesizers.com/the-vco/ A look at the VCO's of some famous analog synthesizers.] by [[Chris Meyer]], The Secret Life of Synthesizers, 25 Oct 2016
* [http://www.alfarzpp.lv/eng/sc/Tuning%20the%20AS3340.pdf Tuning the AS3340] by Rob Hordijk, 2018
* [https://www.richholmes.xyz/topics/synth/howto/3340/ 3340 VCO notes], Rich Holmes
=== Projects ===
* ''[https://www.eddybergman.com/2020/01/synthesizer-build-part-18-really-good.html A really good AS3340 VCO design!!]'' by Eddy Bergman
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* [https://github.com/xnotox/CEM3340 xnotox/CEM3340], GitHub - OpenCem 3340 rev. 3 and Thru Zero Sync Expander
* [https://github.com/brer-rabbit/zoxnoxious Zoxnoxious Analog Synthesizer]
* [https://www.richholmes.xyz/topics/synth/kosmodrome/modules/oscillators/herovco/ AO Hero VCO], [[Kosmo]] format
[[Category:CEM ICs]]
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